I think that you need to get the 1pm flight removed from your itinerary. My understanding is that if you do not fly any sector, then all subsequent sectors are automatically cancelled. That would be bad...
From the book of rules:
14.3.9 If a Member fails to board a Flight Segment of an itinerary containing only Classic Flight Reward Flight Segments, the remaining Segments will be cancelled. The cancelled Segments will only be reinstated if Classic Flight Reward seats are available. If any Segments are reinstated, the Reinstatement Fee will apply (see the
Fee Schedule). In addition the Points required for the entire Itinerary including both travelled and reinstated Segments will be recalculated and any additional Points required will be deducted from the Member's account.